How to earn free Crypto on Coinbase?

Could you kindly elaborate on the methods to acquire Cryptocurrency without spending any money on Coinbase? I'm particularly interested in understanding the steps involved, any prerequisites I may need to fulfill, and any potential limitations or restrictions I should be aware of. Additionally, would it be possible to highlight any special offers or promotions Coinbase might have that could assist me in earning free Crypto? I'm eager to learn more about this opportunity and how I can maximize my earnings on this platform. Thank you for your assistance.